#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

int main()
{
  int server_sockfd, client_sockfd;
  int server_len, client_len;
  struct sockaddr_un server_address;
  struct sockaddr_un client_address;



  unlink("server_socket");
  server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0);


  server_address.sun_family = AF_UNIX;
  strcpy(server_address.sun_path, "server_socket");
  server_len = sizeof(server_address);
  bind(server_sockfd, (struct sockaddr *)&server_address, server_len);


  listen(server_sockfd, 5);
  while(1) {
    char ch;

    printf("server waiting\n");

    client_len = sizeof(client_address);
    client_sockfd = accept(server_sockfd, 
                           (struct sockaddr *)&client_address, &client_len);

    read(client_sockfd, &ch, 1);
    ch++;
    write(client_sockfd, &ch, 1);
    close(client_sockfd);
  }
}

